[Gvsig_english] calculating centre points of polygon and ascribing coordinates
Simon Cropper (Botanicus Australia Pty Ltd)
scropper at botanicusaustralia.com.au
Tue Nov 24 14:20:45 CET 2009
Hi,
I have found some answers.
First X, Y can be extracted with the field calculator using the
functions x() and y().
Sextante can be used to extract the centre point of a polygon.
This aside is there any way of consolidating these tasks? Can you
calculate the centre point of a polygon in gvSIG?
Cheers Simon
Simon Cropper
Botanicus Australia Pty Ltd
PO Box 160, Sunshine, Victoria 3020.
P: 9311 5822. M: 041 830 3437.
mailto: scropper at botanicusaustralia.com.au
<mailto:scropper at botanicusaustralia.com.au>
web: www.botanicusaustralia.com.au <http://www.botanicusaustralia.com.au>
Simon Cropper (Botanicus Australia Pty Ltd) wrote:
> Hi Everyone,
>
> Can someone tell me if gvSIG can be used to establish the centre point
> of a polygon?
>
> ... and subsequently place the X and Y coordinates in fields in the
> attribute table of the polygon shapefile?
>
> ... or alternatively create a point file representing the centrepoint
> and be able to assign the XY values to that shapefile.
>
> What I regularly do in alternative programs (OpenJUMP, Kosmo, Sextante)
> is create a point file showing the centrepoint of a set of polygons
> (usually representing the sites I have surveyed) and then using ArcView
> assign the XY coordinate of the points to the northing+easting fields.
> Reproject into Lat-Long and repeat. These coordinates are used to report
> the sites locations to government agencies.
>
> How would you do this in gvSIG?
>
> Can you use Jpython to do this?
>
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